New Plus subscriber here, are US's Plus deals usually as rad as the EU ones? Arkham, Limbo and Vanquish seems like a pretty dope package
As was previously stated, EU has been "better" most months, but US has stepped it up many times as well, such as the Vita Plus launch, the IGC initial rollout, and for many months before E3 when the twelve games at a time concept was really established.
However, when I say "better," it does depend on what type of gamer you are/have been/will be. EU has been getting the "bigger, splashier, retail games" such as Red Dead Redemption, Deus Ex, and now Arkham City.
But me? I've already bought all those, day one. Sure, it's nice to have them digitally as well, but I much prefer getting games I slept on, or was slightly interested in but not enough to jump, or that I missed, or that I just didn't have time for, or whatever. Awesomenauts is my second favorite game this year, and I still to this day would not have played it if it were not for Plus. KoF XIII and Virtua Fighter 5 are, respectively, the best 2D and 3D fighters around, and I never would have known that for myself had Plus not brought them to me (well, I got an idea of KoF from EVO, but still had not bought it).
So hopefully that helps you make your decision? If you think you'll be frugal with your time and money in the future, and don't care about trophies being tied to your US account, then I'd go EU. If, like me, you buy way too many games as is and are already invested in your US ID, then I'd go with SCEA.